Patterning polyethylene oligomers on carbon nanotubes using physical vapor deposition.
Patterning polyethylene oligomers on carbon nanotubes using physical vapor deposition.
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DOI：
10.1021/nl060276q
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发表时间：
2006-04
期刊：
影响因子：
10.8
通讯作者：
Lingyu Li;Yao Yang;Guoliang Yang;Xuming Chen;B. Hsiao;B. Chu;J. Spanier;Christopher Y. Li
中科院分区：
文献类型：
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作者：
Lingyu Li;Yao Yang;Guoliang Yang;Xuming Chen;B. Hsiao;B. Chu;J. Spanier;Christopher Y. Li
一维碳纳米管的周期性图案化是一个科学和技术研究的热点。在这封信中，我们报告使用一个简单的物理气相沉积方法，以实现周期性的聚乙烯（PE）低聚物图案的个别碳纳米管。在真空下加热时，PE降解成低聚物并结晶成棒状单晶。这些PE棒周期性地装饰在CNT上，其长轴垂直于CNT轴。其形成机理是PE低聚物晶体在碳纳米管上的“软外延”生长。单壁碳纳米管和多壁碳纳米管都成功地用PE棒修饰。这种混合结构的中间状态，多壁碳纳米管吸收了一层薄薄的PE，被成功地捕获通过沉积PE蒸汽上的多壁碳纳米管脱离固体基板，并观察到使用高分辨率透射电子显微镜。此外，这种混合结构的形成关键取决于CNT表面化学：MWNT表面的烷烃改性禁止了CNT上的PE单晶生长。我们预计，这项工作可以打开一个网关，为纳米器件应用程序创建复杂的基于CNT的纳米架构。
Periodic patterning on one-dimensional (1D) carbon nanotubes (CNTs) is of great interest from both scientific and technological points of view. In this letter, we report using a facile physical vapor deposition method to achieve periodic polyethylene (PE) oligomer patterning on individual CNTs. Upon heating under vacuum, PE degraded into oligomers and crystallized into rod-shaped single crystals. These PE rods periodically decorate on CNTs with their long axes perpendicular to the CNT axes. The formation mechanism was attributed to "soft epitaxy" growth of PE oligomer crystals on CNTs. Both SWNTs and MWNTs were decorated successfully with PE rods. The intermediate state of this hybrid structure, MWNTs absorbed with a thin layer of PE, was captured successfully by depositing PE vapor on MWNTs detached from the solid substrate, and was observed using high-resolution transmission electron microscopy. Furthermore, this hybrid structure formation depends critically on CNT surface chemistry: alkane-modification of the MWNT surface prohibited the PE single-crystal growth on the CNTs. We anticipate that this work could open a gateway for creating complex CNT-based nanoarchitectures for nanodevice applications.